IntegerComparator
class qiskit.circuit.library.IntegerComparator(num_state_qubits=None, value=None, geq=True, name='cmp')
Bases: BlueprintCircuit
Integer Comparator.
Operator compares basis states against a classically given integer of fixed value and flips a target qubit if (or depending on the parameter geq):
This operation is based on two’s complement implementation of binary subtraction but only uses carry bits and no actual result bits. If the most significant carry bit (the results bit) is 1, the condition is True otherwise it is False.
Create a new fixed value comparator circuit.
Parameters
- num_state_qubits (int | None) – Number of state qubits. If this is set it will determine the number of qubits required for the circuit.
- value (int | None) – The fixed value to compare with.
- geq (bool) – If True, evaluate a
>=condition, else<. - name (str) – Name of the circuit.
Attributes
ancillas
Returns a list of ancilla bits in the order that the registers were added.
calibrations
Return calibration dictionary.
The custom pulse definition of a given gate is of the form {'gate_name': {(qubits, params): schedule}}
clbits
Returns a list of classical bits in the order that the registers were added.
data
geq
Return whether the comparator compares greater or less equal.
Returns
True, if the comparator compares >=, False if <.
global_phase
Return the global phase of the current circuit scope in radians.
instances
Default value: 196
layout
Return any associated layout information about the circuit
This attribute contains an optional TranspileLayout object. This is typically set on the output from transpile() or PassManager.run() to retain information about the permutations caused on the input circuit by transpilation.
There are two types of permutations caused by the transpile() function, an initial layout which permutes the qubits based on the selected physical qubits on the Target, and a final layout which is an output permutation caused by SwapGates inserted during routing.
metadata
The user provided metadata associated with the circuit.
The metadata for the circuit is a user provided dict of metadata for the circuit. It will not be used to influence the execution or operation of the circuit, but it is expected to be passed between all transforms of the circuit (ie transpilation) and that providers will associate any circuit metadata with the results it returns from execution of that circuit.
num_ancillas
Return the number of ancilla qubits.
num_clbits
Return number of classical bits.
num_parameters
num_qubits
Return number of qubits.
num_state_qubits
The number of qubits encoding the state for the comparison.
Returns
The number of state qubits.
op_start_times
Return a list of operation start times.
This attribute is enabled once one of scheduling analysis passes runs on the quantum circuit.
Returns
List of integers representing instruction start times. The index corresponds to the index of instruction in QuantumCircuit.data.
Raises
AttributeError – When circuit is not scheduled.
parameters
prefix
Default value: 'circuit'
qregs
Type: list[QuantumRegister]
A list of the quantum registers associated with the circuit.
qubits
Returns a list of quantum bits in the order that the registers were added.
value
The value to compare the qubit register to.
Returns
The value against which the value of the qubit register is compared.